Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4471a70da73bbb…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 00:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4e66f80181cec405a4089c42dcc1af2 SHA-1: bd59fbd3e7cea41a2f2555de0900315bc0030444 SHA-256: 9f4471a70da73bbbb68a96cb9d00bbe57ba2f7b0b0eb990f8fc800945724b511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary URL being https://ponafet.ru/wix?keyword=what+is+facebook. This behavior, combined with ClamAV and ML detections, strongly suggests a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure indicates a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/wix?keyword=what+is+facebook
    • https://cdn.sqhk.co/pemenodisoda/WifMBii/wwe_super_showdown_2019_results_bleacher_report.pdf
    • https://cdn.sqhk.co/ledumixifer/ihjfjay/29896856506.pdf
    • https://cdn.sqhk.co/naxupowu/icbmhjU/easy_and_simple_veg_burger_recipe.pdf
    • https://static.s123-cdn-static.com/uploads/4374979/normal_5fce4eeb741b0.pdf
    • https://piguvedulo.weebly.com/uploads/1/3/4/7/134724556/4453889.pdf
    • http://legegapepapo.medianewsonline.com/phrasal_verb_meaning_in_hindi.pdf
    • http://didibemez.scienceontheweb.net/another_day_of_sun_piano_sheet_music_free.pdf
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fd92f799b862.pdf
    • http://fajujefa.getenjoyment.net/bogiselosaburajapano.pdf
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/makixozox.pdf
    • https://static.s123-cdn-static.com/uploads/4444850/normal_5fdf000136c8f.pdf
    • https://cdn.sqhk.co/bogovureg/jc8p5gj/dining_room_tables_for_sale_on_ebay.pdf
    • http://rikafitamedad.medianewsonline.com/oakley_prescription_safety_glasses_australia.pdf
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/dogeruvimubowe.pdf
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/1623863.pdf
    • http://raraveluwogevuw.mypressonline.com/tisodopesusopi.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/f9e4ec2fc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xifeloj.onlinewebshop.net/aprender_a_dibujar_a_lapiz_paso_a_paso.pdf
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_0bcaea994d53462dbad23594a39eb34b.pdf?index=true
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_e5a76f80c2ac453682f72ad48302487e.pdf?index=true
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_d7644fd708b04a14a929fb7b80b83d3a.pdf?index=true
    • http://bujekotu.atwebpages.com/majox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb62.bin
1563607b21a453e679e004935694f7fd8386099a6462fe010de25a6d4c4b06c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 4740 bytes
font_01_sfnt_off0000fb93.bin
06011572148a171b4df3c974c3e42a9a47963dad700aee3351736fddf568518e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 11304 bytes
font_02_sfnt_off000121f6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 4324 bytes

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